|
| |
|
|
Strength-strain analysis of dog prosthesis
Doležalová, Veronika ; Hrstka, Miroslav (referee) ; Vlach, Radek (advisor)
Bachelor thesis deals with strength-deformation analysis of dog prosthesis. Work contains introduction to problems of prosthesis and determination of kinematice during dog’s movements. The analysis was carried out using two approaches, both analytical and numerical. In conclusion, we compare the results of both computational approaches.
|
|
| |
|
| |
|
|
Coupled model of transformer
Adamec, Lukáš ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
The bachelor's thesis deals with the creation of a coupled model of transformer in the Matlab system. The coupled model connects two basic physical domains - electricity and heat transfer. It all starts with the selection of suitable equivalent circuit diagrams that represent the electrical and thermal properties. Their connection is then called as coupled model, which captures their mutual influence. An important part of the thesis is the identification of elements (thermal resistances and capacities, stray inductance, etc.) of equivalent circuit. Open-circuit and short-circuit tests are used to identify electrical elements, thermal elements are then determined from the temperature curves of the sub-parts of the transformer – core and winding. The goal of the thesis is that the output of the coupled model corresponds as closely as possible to the behavior of a real transformer. Compliance is verified by the final simulation.
|
|
|
Experimental equipment for testing of heat pipes efeciency
Vostřel, Vít ; Lošák, Petr (referee) ; Vlach, Radek (advisor)
This bachelor thesis deals with construction of a measuring apparatus for measuring efficiency of heat pipes. The thesis first discusses heat pipes and all components of the measuring apparatus in theoretical way and than it describes construction of the real model and all needed calculations. The apparatus contains a movable arm to which the measured heat pipes are attached. The Arm is able to move form 0° to 90°. The apparatus construction procedure is also described here. The whole apparatus is controlled from the computer using Excel, macros created in Excel and Data Streamer tool.
|
|
|
Rolling bearing stiffness calculation
Koban, Tomáš ; Vlach, Radek (referee) ; Lošák, Petr (advisor)
In this thesis, an analytical approach for calculating the bearing stiffness of ball and cylindrical roller bearings is presented. Three mathematical models have been developed for the case of axial, radial and combined loading. All presented models use Hertz contact theory for determining the roller-raceway contact behavior. Analytical approach is then compared with FEA results. The static numerical simulation of a roller bearing is detailly described. The comparison between analytical and numerical approach is presented for single-row angular contact ball bearing 7304 BECBM and single-row radial cylindrical roller bearing NU 202 ECP. The results show a comprehensive comparison of bearing deflections, internal load distribution and bearing stiffness for each model.
|
|
|
Parameters identification of DC machine coupled model
Kraml, Aleš ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
This thesis deals with design and implementation of experiments leading to identification of parameters of a DC machine, creation of its model with coupled electrical, mechanical and thermal part. The first part describes various methods of modeling thermal resistance between body and ambient and the methods are compared. Furthermore, methods of identifying coefficient of damping and identification of moment of inertia are described. Second part of the thesis describes preparation and identification of resistance of the winding, inductance, heat capacities of rotor and housing and parameter c and measurement of damping coefficients. In the next part, the creation of a Simulink model of the DC machine is described. Furthermore, this thesis describes the algorithm for identification of parameters of an existing machine and the possibilities of using the model and identification in the development of a new machine. The next part assesses using the algorithm of identification and model as a basis for the creation of a virtual twin.
|
|
| |
|
|
Coupled model of solenoid
Hejl, Karel ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
This work deals with the coupled model of an electromagnet and the verification of its results on a real electromagnet. The first chapter of this thesis is an introduction to the issues addressed in this work. The second chapter is devoted to physical analogies between domains and the description of an electromagnet. Also described are mathematical equations for electromagnet from electric, magnetic, mechanical and thermal viewing, as well as descriptions of modelling approaches using Matlab, Simulink and Simscape. The third chapter describes the design of an electromagnet to verify the coupled model. Another section is devoted to compiling equations for this proposed electromagnet and making of models. The penultimate part is dedicated to electromagnet design, measurement and data processing. The last section is devoted to comparing data with simulation and appreciation.
|
guest ::
